check up on vs tick

check up on is not a noun while tick is a noun.

Word	Noun	Adjective	Verb	Adverb
check up on	No	No	Yes	No
tick	Yes	No	Yes	No

check up on (noun)	tick (noun)
	any of two families of small parasitic arachnids with barbed proboscis; feed on blood of warm-blooded animals
	a light mattress
	a mark indicating that something has been noted or completed etc.
	a metallic tapping sound

check up on (verb)	tick (verb)
examine so as to determine accuracy, quality, or condition	put a check mark on or near or next to
	sew
	make a clicking or ticking sound
	make a sound like a clock or a timer